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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Ssh client program. This program can be used to log into a remote machine. | |
6 | * The software supports strong authentication, encryption, and forwarding | |
7 | * of X11, TCP/IP, and authentication connections. | |
8 | * | |
9 | * As far as I am concerned, the code I have written for this software | |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
15 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
540d72c3 | 16 | * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved. |
3c0ef626 | 17 | * |
18 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
19 | * in Canada (German citizen). | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
40 | */ | |
41 | ||
42 | #include "includes.h" | |
540d72c3 | 43 | RCSID("$OpenBSD: ssh.c,v 1.206 2003/12/16 15:49:51 markus Exp $"); |
3c0ef626 | 44 | |
45 | #include <openssl/evp.h> | |
46 | #include <openssl/err.h> | |
47 | ||
48 | #include "ssh.h" | |
49 | #include "ssh1.h" | |
50 | #include "ssh2.h" | |
51 | #include "compat.h" | |
52 | #include "cipher.h" | |
53 | #include "xmalloc.h" | |
54 | #include "packet.h" | |
55 | #include "buffer.h" | |
3c0ef626 | 56 | #include "channels.h" |
57 | #include "key.h" | |
58 | #include "authfd.h" | |
59 | #include "authfile.h" | |
60 | #include "pathnames.h" | |
61 | #include "clientloop.h" | |
62 | #include "log.h" | |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
66 | #include "dispatch.h" | |
67 | #include "misc.h" | |
68 | #include "kex.h" | |
69 | #include "mac.h" | |
70 | #include "sshtty.h" | |
71 | ||
72 | #ifdef SMARTCARD | |
3c0ef626 | 73 | #include "scard.h" |
74 | #endif | |
75 | ||
76 | #ifdef HAVE___PROGNAME | |
77 | extern char *__progname; | |
78 | #else | |
79 | char *__progname; | |
80 | #endif | |
81 | ||
3c0ef626 | 82 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ |
83 | int debug_flag = 0; | |
84 | ||
85 | /* Flag indicating whether a tty should be allocated */ | |
86 | int tty_flag = 0; | |
87 | int no_tty_flag = 0; | |
88 | int force_tty_flag = 0; | |
89 | ||
90 | /* don't exec a shell */ | |
91 | int no_shell_flag = 0; | |
92 | ||
93 | /* | |
94 | * Flag indicating that nothing should be read from stdin. This can be set | |
95 | * on the command line. | |
96 | */ | |
97 | int stdin_null_flag = 0; | |
98 | ||
99 | /* | |
100 | * Flag indicating that ssh should fork after authentication. This is useful | |
44a053a3 | 101 | * so that the passphrase can be entered manually, and then ssh goes to the |
3c0ef626 | 102 | * background. |
103 | */ | |
104 | int fork_after_authentication_flag = 0; | |
105 | ||
106 | /* | |
107 | * General data structure for command line options and options configurable | |
108 | * in configuration files. See readconf.h. | |
109 | */ | |
110 | Options options; | |
111 | ||
112 | /* optional user configfile */ | |
113 | char *config = NULL; | |
114 | ||
115 | /* | |
116 | * Name of the host we are connecting to. This is the name given on the | |
117 | * command line, or the HostName specified for the user-supplied name in a | |
118 | * configuration file. | |
119 | */ | |
120 | char *host; | |
121 | ||
122 | /* socket address the host resolves to */ | |
123 | struct sockaddr_storage hostaddr; | |
124 | ||
125 | /* Private host keys. */ | |
44a053a3 | 126 | Sensitive sensitive_data; |
3c0ef626 | 127 | |
128 | /* Original real UID. */ | |
129 | uid_t original_real_uid; | |
44a053a3 | 130 | uid_t original_effective_uid; |
3c0ef626 | 131 | |
132 | /* command to be executed */ | |
133 | Buffer command; | |
134 | ||
135 | /* Should we execute a command or invoke a subsystem? */ | |
136 | int subsystem_flag = 0; | |
137 | ||
c6046bb0 | 138 | /* # of replies received for global requests */ |
139 | static int client_global_request_id = 0; | |
140 | ||
d03f4262 | 141 | /* pid of proxycommand child process */ |
142 | pid_t proxy_command_pid = 0; | |
143 | ||
3c0ef626 | 144 | /* Prints a help message to the user. This function never returns. */ |
145 | ||
146 | static void | |
147 | usage(void) | |
148 | { | |
149 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); | |
150 | fprintf(stderr, "Options:\n"); | |
151 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
152 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); | |
153 | fprintf(stderr, " -F config Config file (default: ~/%s).\n", | |
154 | _PATH_SSH_USER_CONFFILE); | |
155 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); | |
156 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); | |
3c0ef626 | 157 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
540d72c3 | 158 | fprintf(stderr, " -Y Enable trusted X11 connection forwarding.\n"); |
3c0ef626 | 159 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); |
160 | fprintf(stderr, " -i file Identity for public key authentication " | |
161 | "(default: ~/.ssh/identity)\n"); | |
162 | #ifdef SMARTCARD | |
163 | fprintf(stderr, " -I reader Set smartcard reader.\n"); | |
164 | #endif | |
165 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
166 | fprintf(stderr, " -T Do not allocate a tty.\n"); | |
167 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
168 | fprintf(stderr, " Multiple -v increases verbosity.\n"); | |
169 | fprintf(stderr, " -V Display version number only.\n"); | |
3c0ef626 | 170 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
171 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
172 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
173 | ||
174 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); | |
175 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); | |
176 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
177 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
178 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
179 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); | |
180 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
181 | fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\n"); | |
182 | fprintf(stderr, " -C Enable compression.\n"); | |
183 | fprintf(stderr, " -N Do not execute a shell or command.\n"); | |
184 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); | |
185 | fprintf(stderr, " -1 Force protocol version 1.\n"); | |
186 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
187 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
188 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
189 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); | |
190 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); | |
191 | fprintf(stderr, " -b addr Local IP address.\n"); | |
192 | exit(1); | |
193 | } | |
194 | ||
3c0ef626 | 195 | static int ssh_session(void); |
196 | static int ssh_session2(void); | |
197 | static void load_public_identity_files(void); | |
198 | ||
199 | /* | |
200 | * Main program for the ssh client. | |
201 | */ | |
202 | int | |
203 | main(int ac, char **av) | |
204 | { | |
44a053a3 | 205 | int i, opt, exit_status; |
3c0ef626 | 206 | u_short fwd_port, fwd_host_port; |
207 | char sfwd_port[6], sfwd_host_port[6]; | |
540d72c3 | 208 | char *p, *cp, *line, buf[256]; |
3c0ef626 | 209 | struct stat st; |
210 | struct passwd *pw; | |
211 | int dummy; | |
3c0ef626 | 212 | extern int optind, optreset; |
213 | extern char *optarg; | |
214 | ||
7cac2b65 | 215 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 216 | init_rng(); |
217 | ||
218 | /* | |
219 | * Save the original real uid. It will be needed later (uid-swapping | |
220 | * may clobber the real uid). | |
221 | */ | |
222 | original_real_uid = getuid(); | |
223 | original_effective_uid = geteuid(); | |
540d72c3 | 224 | |
d03f4262 | 225 | /* |
226 | * Use uid-swapping to give up root privileges for the duration of | |
227 | * option processing. We will re-instantiate the rights when we are | |
228 | * ready to create the privileged port, and will permanently drop | |
229 | * them when the port has been created (actually, when the connection | |
230 | * has been made, as we may need to create the port several times). | |
231 | */ | |
232 | PRIV_END; | |
3c0ef626 | 233 | |
234 | #ifdef HAVE_SETRLIMIT | |
235 | /* If we are installed setuid root be careful to not drop core. */ | |
236 | if (original_real_uid != original_effective_uid) { | |
237 | struct rlimit rlim; | |
238 | rlim.rlim_cur = rlim.rlim_max = 0; | |
239 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
240 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
241 | } | |
242 | #endif | |
243 | /* Get user data. */ | |
244 | pw = getpwuid(original_real_uid); | |
245 | if (!pw) { | |
7cac2b65 | 246 | logit("You don't exist, go away!"); |
3c0ef626 | 247 | exit(1); |
248 | } | |
249 | /* Take a copy of the returned structure. */ | |
250 | pw = pwcopy(pw); | |
251 | ||
3c0ef626 | 252 | /* |
253 | * Set our umask to something reasonable, as some files are created | |
254 | * with the default umask. This will make them world-readable but | |
255 | * writable only by the owner, which is ok for all files for which we | |
256 | * don't set the modes explicitly. | |
257 | */ | |
258 | umask(022); | |
259 | ||
260 | /* Initialize option structure to indicate that no values have been set. */ | |
261 | initialize_options(&options); | |
262 | ||
263 | /* Parse command-line arguments. */ | |
264 | host = NULL; | |
265 | ||
266 | again: | |
267 | while ((opt = getopt(ac, av, | |
540d72c3 | 268 | "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVXY")) != -1) { |
3c0ef626 | 269 | switch (opt) { |
270 | case '1': | |
271 | options.protocol = SSH_PROTO_1; | |
272 | break; | |
273 | case '2': | |
274 | options.protocol = SSH_PROTO_2; | |
275 | break; | |
276 | case '4': | |
7cac2b65 | 277 | options.address_family = AF_INET; |
3c0ef626 | 278 | break; |
279 | case '6': | |
7cac2b65 | 280 | options.address_family = AF_INET6; |
3c0ef626 | 281 | break; |
282 | case 'n': | |
283 | stdin_null_flag = 1; | |
284 | break; | |
285 | case 'f': | |
286 | fork_after_authentication_flag = 1; | |
287 | stdin_null_flag = 1; | |
288 | break; | |
289 | case 'x': | |
290 | options.forward_x11 = 0; | |
291 | break; | |
292 | case 'X': | |
293 | options.forward_x11 = 1; | |
294 | break; | |
540d72c3 | 295 | case 'Y': |
296 | options.forward_x11 = 1; | |
297 | options.forward_x11_trusted = 1; | |
298 | break; | |
3c0ef626 | 299 | case 'g': |
300 | options.gateway_ports = 1; | |
301 | break; | |
d03f4262 | 302 | case 'P': /* deprecated */ |
3c0ef626 | 303 | options.use_privileged_port = 0; |
304 | break; | |
305 | case 'a': | |
306 | options.forward_agent = 0; | |
307 | break; | |
308 | case 'A': | |
309 | options.forward_agent = 1; | |
310 | break; | |
3c0ef626 | 311 | case 'k': |
540d72c3 | 312 | options.gss_deleg_creds = 0; |
3c0ef626 | 313 | break; |
3c0ef626 | 314 | case 'i': |
315 | if (stat(optarg, &st) < 0) { | |
316 | fprintf(stderr, "Warning: Identity file %s " | |
317 | "does not exist.\n", optarg); | |
318 | break; | |
319 | } | |
320 | if (options.num_identity_files >= | |
321 | SSH_MAX_IDENTITY_FILES) | |
322 | fatal("Too many identity files specified " | |
323 | "(max %d)", SSH_MAX_IDENTITY_FILES); | |
324 | options.identity_files[options.num_identity_files++] = | |
325 | xstrdup(optarg); | |
326 | break; | |
327 | case 'I': | |
328 | #ifdef SMARTCARD | |
329 | options.smartcard_device = xstrdup(optarg); | |
330 | #else | |
331 | fprintf(stderr, "no support for smartcards.\n"); | |
332 | #endif | |
333 | break; | |
334 | case 't': | |
335 | if (tty_flag) | |
336 | force_tty_flag = 1; | |
337 | tty_flag = 1; | |
338 | break; | |
339 | case 'v': | |
7cac2b65 | 340 | if (debug_flag == 0) { |
3c0ef626 | 341 | debug_flag = 1; |
342 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
7cac2b65 | 343 | } else { |
344 | if (options.log_level < SYSLOG_LEVEL_DEBUG3) | |
345 | options.log_level++; | |
3c0ef626 | 346 | break; |
7cac2b65 | 347 | } |
3c0ef626 | 348 | /* fallthrough */ |
349 | case 'V': | |
350 | fprintf(stderr, | |
7cac2b65 | 351 | "%s, SSH protocols %d.%d/%d.%d, %s\n", |
3c0ef626 | 352 | SSH_VERSION, |
353 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
354 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, | |
7cac2b65 | 355 | SSLeay_version(SSLEAY_VERSION)); |
3c0ef626 | 356 | if (opt == 'V') |
357 | exit(0); | |
358 | break; | |
359 | case 'q': | |
360 | options.log_level = SYSLOG_LEVEL_QUIET; | |
361 | break; | |
362 | case 'e': | |
363 | if (optarg[0] == '^' && optarg[2] == 0 && | |
364 | (u_char) optarg[1] >= 64 && | |
365 | (u_char) optarg[1] < 128) | |
366 | options.escape_char = (u_char) optarg[1] & 31; | |
367 | else if (strlen(optarg) == 1) | |
368 | options.escape_char = (u_char) optarg[0]; | |
369 | else if (strcmp(optarg, "none") == 0) | |
370 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
371 | else { | |
372 | fprintf(stderr, "Bad escape character '%s'.\n", | |
373 | optarg); | |
374 | exit(1); | |
375 | } | |
376 | break; | |
377 | case 'c': | |
378 | if (ciphers_valid(optarg)) { | |
379 | /* SSH2 only */ | |
380 | options.ciphers = xstrdup(optarg); | |
381 | options.cipher = SSH_CIPHER_ILLEGAL; | |
382 | } else { | |
383 | /* SSH1 only */ | |
384 | options.cipher = cipher_number(optarg); | |
385 | if (options.cipher == -1) { | |
386 | fprintf(stderr, | |
387 | "Unknown cipher type '%s'\n", | |
388 | optarg); | |
389 | exit(1); | |
390 | } | |
391 | if (options.cipher == SSH_CIPHER_3DES) | |
392 | options.ciphers = "3des-cbc"; | |
393 | else if (options.cipher == SSH_CIPHER_BLOWFISH) | |
394 | options.ciphers = "blowfish-cbc"; | |
395 | else | |
396 | options.ciphers = (char *)-1; | |
397 | } | |
398 | break; | |
399 | case 'm': | |
400 | if (mac_valid(optarg)) | |
401 | options.macs = xstrdup(optarg); | |
402 | else { | |
403 | fprintf(stderr, "Unknown mac type '%s'\n", | |
404 | optarg); | |
405 | exit(1); | |
406 | } | |
407 | break; | |
408 | case 'p': | |
409 | options.port = a2port(optarg); | |
410 | if (options.port == 0) { | |
411 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
412 | exit(1); | |
413 | } | |
414 | break; | |
415 | case 'l': | |
416 | options.user = optarg; | |
417 | break; | |
418 | ||
419 | case 'L': | |
420 | case 'R': | |
7cac2b65 | 421 | if (sscanf(optarg, "%5[0123456789]:%255[^:]:%5[0123456789]", |
3c0ef626 | 422 | sfwd_port, buf, sfwd_host_port) != 3 && |
7cac2b65 | 423 | sscanf(optarg, "%5[0123456789]/%255[^/]/%5[0123456789]", |
3c0ef626 | 424 | sfwd_port, buf, sfwd_host_port) != 3) { |
425 | fprintf(stderr, | |
426 | "Bad forwarding specification '%s'\n", | |
427 | optarg); | |
428 | usage(); | |
429 | /* NOTREACHED */ | |
430 | } | |
431 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
c6046bb0 | 432 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { |
3c0ef626 | 433 | fprintf(stderr, |
434 | "Bad forwarding port(s) '%s'\n", optarg); | |
435 | exit(1); | |
436 | } | |
437 | if (opt == 'L') | |
438 | add_local_forward(&options, fwd_port, buf, | |
439 | fwd_host_port); | |
440 | else if (opt == 'R') | |
441 | add_remote_forward(&options, fwd_port, buf, | |
c6046bb0 | 442 | fwd_host_port); |
3c0ef626 | 443 | break; |
444 | ||
445 | case 'D': | |
446 | fwd_port = a2port(optarg); | |
447 | if (fwd_port == 0) { | |
448 | fprintf(stderr, "Bad dynamic port '%s'\n", | |
449 | optarg); | |
450 | exit(1); | |
451 | } | |
7cac2b65 | 452 | add_local_forward(&options, fwd_port, "socks", 0); |
3c0ef626 | 453 | break; |
454 | ||
455 | case 'C': | |
456 | options.compression = 1; | |
457 | break; | |
458 | case 'N': | |
459 | no_shell_flag = 1; | |
460 | no_tty_flag = 1; | |
461 | break; | |
462 | case 'T': | |
463 | no_tty_flag = 1; | |
464 | break; | |
465 | case 'o': | |
466 | dummy = 1; | |
540d72c3 | 467 | line = xstrdup(optarg); |
3c0ef626 | 468 | if (process_config_line(&options, host ? host : "", |
540d72c3 | 469 | line, "command-line", 0, &dummy) != 0) |
3c0ef626 | 470 | exit(1); |
540d72c3 | 471 | xfree(line); |
3c0ef626 | 472 | break; |
473 | case 's': | |
474 | subsystem_flag = 1; | |
475 | break; | |
476 | case 'b': | |
477 | options.bind_address = optarg; | |
478 | break; | |
479 | case 'F': | |
480 | config = optarg; | |
481 | break; | |
482 | default: | |
483 | usage(); | |
484 | } | |
485 | } | |
486 | ||
487 | ac -= optind; | |
488 | av += optind; | |
489 | ||
490 | if (ac > 0 && !host && **av != '-') { | |
bfe49944 | 491 | if (strrchr(*av, '@')) { |
3c0ef626 | 492 | p = xstrdup(*av); |
bfe49944 | 493 | cp = strrchr(p, '@'); |
3c0ef626 | 494 | if (cp == NULL || cp == p) |
495 | usage(); | |
496 | options.user = p; | |
497 | *cp = '\0'; | |
498 | host = ++cp; | |
499 | } else | |
500 | host = *av; | |
bfe49944 | 501 | if (ac > 1) { |
502 | optind = optreset = 1; | |
3c0ef626 | 503 | goto again; |
504 | } | |
bfe49944 | 505 | ac--, av++; |
3c0ef626 | 506 | } |
507 | ||
508 | /* Check that we got a host name. */ | |
509 | if (!host) | |
510 | usage(); | |
511 | ||
512 | SSLeay_add_all_algorithms(); | |
513 | ERR_load_crypto_strings(); | |
3c0ef626 | 514 | |
515 | /* Initialize the command to execute on remote host. */ | |
516 | buffer_init(&command); | |
517 | ||
518 | /* | |
519 | * Save the command to execute on the remote host in a buffer. There | |
520 | * is no limit on the length of the command, except by the maximum | |
521 | * packet size. Also sets the tty flag if there is no command. | |
522 | */ | |
523 | if (!ac) { | |
524 | /* No command specified - execute shell on a tty. */ | |
525 | tty_flag = 1; | |
526 | if (subsystem_flag) { | |
527 | fprintf(stderr, | |
528 | "You must specify a subsystem to invoke.\n"); | |
529 | usage(); | |
530 | } | |
531 | } else { | |
532 | /* A command has been specified. Store it into the buffer. */ | |
533 | for (i = 0; i < ac; i++) { | |
534 | if (i) | |
535 | buffer_append(&command, " ", 1); | |
536 | buffer_append(&command, av[i], strlen(av[i])); | |
537 | } | |
538 | } | |
539 | ||
540 | /* Cannot fork to background if no command. */ | |
541 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
542 | fatal("Cannot fork into background without a command to execute."); | |
543 | ||
544 | /* Allocate a tty by default if no command specified. */ | |
545 | if (buffer_len(&command) == 0) | |
546 | tty_flag = 1; | |
547 | ||
d03f4262 | 548 | /* Force no tty */ |
3c0ef626 | 549 | if (no_tty_flag) |
550 | tty_flag = 0; | |
551 | /* Do not allocate a tty if stdin is not a tty. */ | |
552 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
553 | if (tty_flag) | |
7cac2b65 | 554 | logit("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
3c0ef626 | 555 | tty_flag = 0; |
556 | } | |
557 | ||
558 | /* | |
559 | * Initialize "log" output. Since we are the client all output | |
560 | * actually goes to stderr. | |
561 | */ | |
562 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
563 | SYSLOG_FACILITY_USER, 1); | |
564 | ||
565 | /* | |
566 | * Read per-user configuration file. Ignore the system wide config | |
567 | * file if the user specifies a config file on the command line. | |
568 | */ | |
569 | if (config != NULL) { | |
570 | if (!read_config_file(config, host, &options)) | |
571 | fatal("Can't open user config file %.100s: " | |
572 | "%.100s", config, strerror(errno)); | |
573 | } else { | |
c6046bb0 | 574 | /* |
575 | * Since the config file parsing code aborts if it sees | |
576 | * options it doesn't recognize, allow users to put | |
577 | * options specific to compile-time add-ons in alternate | |
578 | * config files so their primary config file will | |
579 | * interoperate SSH versions that don't support those | |
580 | * options. | |
581 | */ | |
582 | #ifdef GSSAPI | |
583 | snprintf(buf, sizeof buf, "%.100s/%.100s.gssapi", pw->pw_dir, | |
584 | _PATH_SSH_USER_CONFFILE); | |
585 | (void)read_config_file(buf, host, &options); | |
586 | #ifdef GSI | |
587 | snprintf(buf, sizeof buf, "%.100s/%.100s.gsi", pw->pw_dir, | |
588 | _PATH_SSH_USER_CONFFILE); | |
589 | (void)read_config_file(buf, host, &options); | |
590 | #endif | |
7cac2b65 | 591 | #if defined(KRB5) |
c6046bb0 | 592 | snprintf(buf, sizeof buf, "%.100s/%.100s.krb", pw->pw_dir, |
593 | _PATH_SSH_USER_CONFFILE); | |
594 | (void)read_config_file(buf, host, &options); | |
595 | #endif | |
c6046bb0 | 596 | #endif |
3c0ef626 | 597 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, |
598 | _PATH_SSH_USER_CONFFILE); | |
599 | (void)read_config_file(buf, host, &options); | |
600 | ||
601 | /* Read systemwide configuration file after use config. */ | |
602 | (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); | |
603 | } | |
604 | ||
605 | /* Fill configuration defaults. */ | |
606 | fill_default_options(&options); | |
607 | ||
7cac2b65 | 608 | channel_set_af(options.address_family); |
609 | ||
3c0ef626 | 610 | /* reinit */ |
611 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
612 | ||
613 | seed_rng(); | |
614 | ||
7cac2b65 | 615 | if (options.user == NULL) { |
616 | options.user = xstrdup(pw->pw_name); | |
617 | options.implicit = 1; | |
618 | } | |
73a68d83 | 619 | else options.implicit = 0; |
3c0ef626 | 620 | |
621 | if (options.hostname != NULL) | |
622 | host = options.hostname; | |
623 | ||
7cac2b65 | 624 | /* force lowercase for hostkey matching */ |
625 | if (options.host_key_alias != NULL) { | |
626 | for (p = options.host_key_alias; *p; p++) | |
627 | if (isupper(*p)) | |
628 | *p = tolower(*p); | |
629 | } | |
630 | ||
bfe49944 | 631 | if (options.proxy_command != NULL && |
632 | strcmp(options.proxy_command, "none") == 0) | |
633 | options.proxy_command = NULL; | |
634 | ||
3c0ef626 | 635 | /* Open a connection to the remote host. */ |
7cac2b65 | 636 | if (ssh_connect(host, &hostaddr, options.port, |
637 | options.address_family, options.connection_attempts, | |
44a053a3 | 638 | #ifdef HAVE_CYGWIN |
639 | options.use_privileged_port, | |
640 | #else | |
641 | original_effective_uid == 0 && options.use_privileged_port, | |
642 | #endif | |
643 | options.proxy_command) != 0) | |
644 | exit(1); | |
3c0ef626 | 645 | |
646 | /* | |
647 | * If we successfully made the connection, load the host private key | |
648 | * in case we will need it later for combined rsa-rhosts | |
649 | * authentication. This must be done before releasing extra | |
650 | * privileges, because the file is only readable by root. | |
44a053a3 | 651 | * If we cannot access the private keys, load the public keys |
652 | * instead and try to execute the ssh-keysign helper instead. | |
3c0ef626 | 653 | */ |
654 | sensitive_data.nkeys = 0; | |
655 | sensitive_data.keys = NULL; | |
44a053a3 | 656 | sensitive_data.external_keysign = 0; |
657 | if (options.rhosts_rsa_authentication || | |
658 | options.hostbased_authentication) { | |
3c0ef626 | 659 | sensitive_data.nkeys = 3; |
d03f4262 | 660 | sensitive_data.keys = xmalloc(sensitive_data.nkeys * |
661 | sizeof(Key)); | |
44a053a3 | 662 | |
663 | PRIV_START; | |
3c0ef626 | 664 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
665 | _PATH_HOST_KEY_FILE, "", NULL); | |
666 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
667 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
668 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
669 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
44a053a3 | 670 | PRIV_END; |
671 | ||
d03f4262 | 672 | if (options.hostbased_authentication == 1 && |
673 | sensitive_data.keys[0] == NULL && | |
44a053a3 | 674 | sensitive_data.keys[1] == NULL && |
675 | sensitive_data.keys[2] == NULL) { | |
676 | sensitive_data.keys[1] = key_load_public( | |
677 | _PATH_HOST_DSA_KEY_FILE, NULL); | |
678 | sensitive_data.keys[2] = key_load_public( | |
679 | _PATH_HOST_RSA_KEY_FILE, NULL); | |
680 | sensitive_data.external_keysign = 1; | |
681 | } | |
3c0ef626 | 682 | } |
683 | /* | |
684 | * Get rid of any extra privileges that we may have. We will no | |
685 | * longer need them. Also, extra privileges could make it very hard | |
686 | * to read identity files and other non-world-readable files from the | |
687 | * user's home directory if it happens to be on a NFS volume where | |
688 | * root is mapped to nobody. | |
689 | */ | |
44a053a3 | 690 | seteuid(original_real_uid); |
691 | setuid(original_real_uid); | |
3c0ef626 | 692 | |
693 | /* | |
694 | * Now that we are back to our own permissions, create ~/.ssh | |
695 | * directory if it doesn\'t already exist. | |
696 | */ | |
697 | snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); | |
698 | if (stat(buf, &st) < 0) | |
699 | if (mkdir(buf, 0700) < 0) | |
700 | error("Could not create directory '%.200s'.", buf); | |
701 | ||
3c0ef626 | 702 | /* load options.identity_files */ |
703 | load_public_identity_files(); | |
704 | ||
705 | /* Expand ~ in known host file names. */ | |
706 | /* XXX mem-leaks: */ | |
707 | options.system_hostfile = | |
708 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
709 | options.user_hostfile = | |
710 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
711 | options.system_hostfile2 = | |
712 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
713 | options.user_hostfile2 = | |
714 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
715 | ||
716 | signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ | |
717 | ||
718 | /* Log into the remote system. This never returns if the login fails. */ | |
44a053a3 | 719 | ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw); |
3c0ef626 | 720 | |
721 | /* We no longer need the private host keys. Clear them now. */ | |
722 | if (sensitive_data.nkeys != 0) { | |
723 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
724 | if (sensitive_data.keys[i] != NULL) { | |
725 | /* Destroys contents safely */ | |
726 | debug3("clear hostkey %d", i); | |
727 | key_free(sensitive_data.keys[i]); | |
728 | sensitive_data.keys[i] = NULL; | |
729 | } | |
730 | } | |
731 | xfree(sensitive_data.keys); | |
732 | } | |
733 | for (i = 0; i < options.num_identity_files; i++) { | |
734 | if (options.identity_files[i]) { | |
735 | xfree(options.identity_files[i]); | |
736 | options.identity_files[i] = NULL; | |
737 | } | |
738 | if (options.identity_keys[i]) { | |
739 | key_free(options.identity_keys[i]); | |
740 | options.identity_keys[i] = NULL; | |
741 | } | |
742 | } | |
743 | ||
744 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
745 | packet_close(); | |
d03f4262 | 746 | |
747 | /* | |
540d72c3 | 748 | * Send SIGHUP to proxy command if used. We don't wait() in |
d03f4262 | 749 | * case it hangs and instead rely on init to reap the child |
750 | */ | |
751 | if (proxy_command_pid > 1) | |
752 | kill(proxy_command_pid, SIGHUP); | |
753 | ||
3c0ef626 | 754 | return exit_status; |
755 | } | |
756 | ||
540d72c3 | 757 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
758 | ||
3c0ef626 | 759 | static void |
c6046bb0 | 760 | x11_get_proto(char **_proto, char **_data) |
3c0ef626 | 761 | { |
540d72c3 | 762 | char cmd[1024]; |
3c0ef626 | 763 | char line[512]; |
540d72c3 | 764 | char xdisplay[512]; |
c6046bb0 | 765 | static char proto[512], data[512]; |
3c0ef626 | 766 | FILE *f; |
540d72c3 | 767 | int got_data = 0, generated = 0, do_unlink = 0, i; |
768 | char *display, *xauthdir, *xauthfile; | |
d03f4262 | 769 | struct stat st; |
3c0ef626 | 770 | |
540d72c3 | 771 | xauthdir = xauthfile = NULL; |
c6046bb0 | 772 | *_proto = proto; |
773 | *_data = data; | |
774 | proto[0] = data[0] = '\0'; | |
540d72c3 | 775 | |
d03f4262 | 776 | if (!options.xauth_location || |
777 | (stat(options.xauth_location, &st) == -1)) { | |
778 | debug("No xauth program."); | |
779 | } else { | |
780 | if ((display = getenv("DISPLAY")) == NULL) { | |
781 | debug("x11_get_proto: DISPLAY not set"); | |
782 | return; | |
783 | } | |
540d72c3 | 784 | /* |
785 | * Handle FamilyLocal case where $DISPLAY does | |
786 | * not match an authorization entry. For this we | |
787 | * just try "xauth list unix:displaynum.screennum". | |
788 | * XXX: "localhost" match to determine FamilyLocal | |
789 | * is not perfect. | |
790 | */ | |
791 | if (strncmp(display, "localhost:", 10) == 0) { | |
792 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
793 | display + 10); | |
794 | display = xdisplay; | |
795 | } | |
796 | if (options.forward_x11_trusted == 0) { | |
797 | xauthdir = xmalloc(MAXPATHLEN); | |
798 | xauthfile = xmalloc(MAXPATHLEN); | |
799 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
800 | if (mkdtemp(xauthdir) != NULL) { | |
801 | do_unlink = 1; | |
802 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
803 | xauthdir); | |
804 | snprintf(cmd, sizeof(cmd), | |
805 | "%s -f %s generate %s " SSH_X11_PROTO | |
806 | " untrusted timeout 120 2>" _PATH_DEVNULL, | |
807 | options.xauth_location, xauthfile, display); | |
808 | debug2("x11_get_proto: %s", cmd); | |
809 | if (system(cmd) == 0) | |
810 | generated = 1; | |
811 | } | |
812 | } | |
813 | snprintf(cmd, sizeof(cmd), | |
814 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
815 | options.xauth_location, | |
816 | generated ? "-f " : "" , | |
817 | generated ? xauthfile : "", | |
818 | display); | |
819 | debug2("x11_get_proto: %s", cmd); | |
820 | f = popen(cmd, "r"); | |
3c0ef626 | 821 | if (f && fgets(line, sizeof(line), f) && |
c6046bb0 | 822 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
3c0ef626 | 823 | got_data = 1; |
824 | if (f) | |
825 | pclose(f); | |
826 | } | |
540d72c3 | 827 | |
828 | if (do_unlink) { | |
829 | unlink(xauthfile); | |
830 | rmdir(xauthdir); | |
831 | } | |
832 | if (xauthdir) | |
833 | xfree(xauthdir); | |
834 | if (xauthfile) | |
835 | xfree(xauthfile); | |
836 | ||
3c0ef626 | 837 | /* |
838 | * If we didn't get authentication data, just make up some | |
839 | * data. The forwarding code will check the validity of the | |
840 | * response anyway, and substitute this data. The X11 | |
841 | * server, however, will ignore this fake data and use | |
842 | * whatever authentication mechanisms it was using otherwise | |
843 | * for the local connection. | |
844 | */ | |
845 | if (!got_data) { | |
846 | u_int32_t rand = 0; | |
847 | ||
540d72c3 | 848 | logit("Warning: No xauth data; " |
849 | "using fake authentication data for X11 forwarding."); | |
850 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
3c0ef626 | 851 | for (i = 0; i < 16; i++) { |
852 | if (i % 4 == 0) | |
853 | rand = arc4random(); | |
540d72c3 | 854 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
855 | rand & 0xff); | |
3c0ef626 | 856 | rand >>= 8; |
857 | } | |
858 | } | |
859 | } | |
860 | ||
861 | static void | |
862 | ssh_init_forwarding(void) | |
863 | { | |
864 | int success = 0; | |
865 | int i; | |
866 | ||
867 | /* Initiate local TCP/IP port forwardings. */ | |
868 | for (i = 0; i < options.num_local_forwards; i++) { | |
869 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
870 | options.local_forwards[i].port, | |
871 | options.local_forwards[i].host, | |
872 | options.local_forwards[i].host_port); | |
c6046bb0 | 873 | success += channel_setup_local_fwd_listener( |
3c0ef626 | 874 | options.local_forwards[i].port, |
875 | options.local_forwards[i].host, | |
876 | options.local_forwards[i].host_port, | |
877 | options.gateway_ports); | |
878 | } | |
879 | if (i > 0 && success == 0) | |
880 | error("Could not request local forwarding."); | |
881 | ||
882 | /* Initiate remote TCP/IP port forwardings. */ | |
883 | for (i = 0; i < options.num_remote_forwards; i++) { | |
884 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
885 | options.remote_forwards[i].port, | |
886 | options.remote_forwards[i].host, | |
887 | options.remote_forwards[i].host_port); | |
888 | channel_request_remote_forwarding( | |
889 | options.remote_forwards[i].port, | |
890 | options.remote_forwards[i].host, | |
891 | options.remote_forwards[i].host_port); | |
892 | } | |
893 | } | |
894 | ||
895 | static void | |
896 | check_agent_present(void) | |
897 | { | |
898 | if (options.forward_agent) { | |
899 | /* Clear agent forwarding if we don\'t have an agent. */ | |
d03f4262 | 900 | if (!ssh_agent_present()) |
3c0ef626 | 901 | options.forward_agent = 0; |
3c0ef626 | 902 | } |
903 | } | |
904 | ||
905 | static int | |
906 | ssh_session(void) | |
907 | { | |
908 | int type; | |
3c0ef626 | 909 | int interactive = 0; |
910 | int have_tty = 0; | |
911 | struct winsize ws; | |
912 | char *cp; | |
913 | ||
914 | /* Enable compression if requested. */ | |
915 | if (options.compression) { | |
916 | debug("Requesting compression at level %d.", options.compression_level); | |
917 | ||
918 | if (options.compression_level < 1 || options.compression_level > 9) | |
919 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
920 | ||
921 | /* Send the request. */ | |
922 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
923 | packet_put_int(options.compression_level); | |
924 | packet_send(); | |
925 | packet_write_wait(); | |
c6046bb0 | 926 | type = packet_read(); |
3c0ef626 | 927 | if (type == SSH_SMSG_SUCCESS) |
928 | packet_start_compression(options.compression_level); | |
929 | else if (type == SSH_SMSG_FAILURE) | |
7cac2b65 | 930 | logit("Warning: Remote host refused compression."); |
3c0ef626 | 931 | else |
932 | packet_disconnect("Protocol error waiting for compression response."); | |
933 | } | |
934 | /* Allocate a pseudo tty if appropriate. */ | |
935 | if (tty_flag) { | |
936 | debug("Requesting pty."); | |
937 | ||
938 | /* Start the packet. */ | |
939 | packet_start(SSH_CMSG_REQUEST_PTY); | |
940 | ||
941 | /* Store TERM in the packet. There is no limit on the | |
942 | length of the string. */ | |
943 | cp = getenv("TERM"); | |
944 | if (!cp) | |
945 | cp = ""; | |
946 | packet_put_cstring(cp); | |
947 | ||
948 | /* Store window size in the packet. */ | |
949 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
950 | memset(&ws, 0, sizeof(ws)); | |
951 | packet_put_int(ws.ws_row); | |
952 | packet_put_int(ws.ws_col); | |
953 | packet_put_int(ws.ws_xpixel); | |
954 | packet_put_int(ws.ws_ypixel); | |
955 | ||
956 | /* Store tty modes in the packet. */ | |
957 | tty_make_modes(fileno(stdin), NULL); | |
958 | ||
959 | /* Send the packet, and wait for it to leave. */ | |
960 | packet_send(); | |
961 | packet_write_wait(); | |
962 | ||
963 | /* Read response from the server. */ | |
c6046bb0 | 964 | type = packet_read(); |
3c0ef626 | 965 | if (type == SSH_SMSG_SUCCESS) { |
966 | interactive = 1; | |
967 | have_tty = 1; | |
968 | } else if (type == SSH_SMSG_FAILURE) | |
7cac2b65 | 969 | logit("Warning: Remote host failed or refused to allocate a pseudo tty."); |
3c0ef626 | 970 | else |
971 | packet_disconnect("Protocol error waiting for pty request response."); | |
972 | } | |
973 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
974 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
c6046bb0 | 975 | char *proto, *data; |
3c0ef626 | 976 | /* Get reasonable local authentication information. */ |
c6046bb0 | 977 | x11_get_proto(&proto, &data); |
3c0ef626 | 978 | /* Request forwarding with authentication spoofing. */ |
979 | debug("Requesting X11 forwarding with authentication spoofing."); | |
980 | x11_request_forwarding_with_spoofing(0, proto, data); | |
981 | ||
982 | /* Read response from the server. */ | |
c6046bb0 | 983 | type = packet_read(); |
3c0ef626 | 984 | if (type == SSH_SMSG_SUCCESS) { |
985 | interactive = 1; | |
986 | } else if (type == SSH_SMSG_FAILURE) { | |
7cac2b65 | 987 | logit("Warning: Remote host denied X11 forwarding."); |
3c0ef626 | 988 | } else { |
989 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
990 | } | |
991 | } | |
992 | /* Tell the packet module whether this is an interactive session. */ | |
993 | packet_set_interactive(interactive); | |
994 | ||
995 | /* Request authentication agent forwarding if appropriate. */ | |
996 | check_agent_present(); | |
997 | ||
998 | if (options.forward_agent) { | |
999 | debug("Requesting authentication agent forwarding."); | |
1000 | auth_request_forwarding(); | |
1001 | ||
1002 | /* Read response from the server. */ | |
c6046bb0 | 1003 | type = packet_read(); |
1004 | packet_check_eom(); | |
3c0ef626 | 1005 | if (type != SSH_SMSG_SUCCESS) |
7cac2b65 | 1006 | logit("Warning: Remote host denied authentication agent forwarding."); |
3c0ef626 | 1007 | } |
1008 | ||
1009 | /* Initiate port forwardings. */ | |
1010 | ssh_init_forwarding(); | |
1011 | ||
1012 | /* If requested, let ssh continue in the background. */ | |
1013 | if (fork_after_authentication_flag) | |
1014 | if (daemon(1, 1) < 0) | |
1015 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1016 | ||
1017 | /* | |
1018 | * If a command was specified on the command line, execute the | |
1019 | * command now. Otherwise request the server to start a shell. | |
1020 | */ | |
1021 | if (buffer_len(&command) > 0) { | |
1022 | int len = buffer_len(&command); | |
1023 | if (len > 900) | |
1024 | len = 900; | |
c6046bb0 | 1025 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1026 | packet_start(SSH_CMSG_EXEC_CMD); |
1027 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1028 | packet_send(); | |
1029 | packet_write_wait(); | |
1030 | } else { | |
1031 | debug("Requesting shell."); | |
1032 | packet_start(SSH_CMSG_EXEC_SHELL); | |
1033 | packet_send(); | |
1034 | packet_write_wait(); | |
1035 | } | |
1036 | ||
1037 | /* Enter the interactive session. */ | |
1038 | return client_loop(have_tty, tty_flag ? | |
1039 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
1040 | } | |
1041 | ||
1042 | static void | |
c6046bb0 | 1043 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1044 | { |
1045 | int id, len; | |
1046 | ||
1047 | id = packet_get_int(); | |
1048 | len = buffer_len(&command); | |
1049 | if (len > 900) | |
1050 | len = 900; | |
c6046bb0 | 1051 | packet_check_eom(); |
3c0ef626 | 1052 | if (type == SSH2_MSG_CHANNEL_FAILURE) |
1053 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
c6046bb0 | 1054 | len, (u_char *)buffer_ptr(&command), id); |
1055 | } | |
1056 | ||
1057 | void | |
540d72c3 | 1058 | client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt) |
c6046bb0 | 1059 | { |
1060 | int i; | |
1061 | ||
1062 | i = client_global_request_id++; | |
540d72c3 | 1063 | if (i >= options.num_remote_forwards) |
c6046bb0 | 1064 | return; |
c6046bb0 | 1065 | debug("remote forward %s for: listen %d, connect %s:%d", |
1066 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", | |
1067 | options.remote_forwards[i].port, | |
1068 | options.remote_forwards[i].host, | |
1069 | options.remote_forwards[i].host_port); | |
1070 | if (type == SSH2_MSG_REQUEST_FAILURE) | |
7cac2b65 | 1071 | logit("Warning: remote port forwarding failed for listen port %d", |
c6046bb0 | 1072 | options.remote_forwards[i].port); |
3c0ef626 | 1073 | } |
1074 | ||
1075 | /* request pty/x11/agent/tcpfwd/shell for channel */ | |
1076 | static void | |
1077 | ssh_session2_setup(int id, void *arg) | |
1078 | { | |
1079 | int len; | |
1080 | int interactive = 0; | |
1081 | struct termios tio; | |
1082 | ||
bfe49944 | 1083 | debug2("ssh_session2_setup: id %d", id); |
3c0ef626 | 1084 | |
1085 | if (tty_flag) { | |
1086 | struct winsize ws; | |
1087 | char *cp; | |
1088 | cp = getenv("TERM"); | |
1089 | if (!cp) | |
1090 | cp = ""; | |
1091 | /* Store window size in the packet. */ | |
1092 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1093 | memset(&ws, 0, sizeof(ws)); | |
1094 | ||
1095 | channel_request_start(id, "pty-req", 0); | |
1096 | packet_put_cstring(cp); | |
1097 | packet_put_int(ws.ws_col); | |
1098 | packet_put_int(ws.ws_row); | |
1099 | packet_put_int(ws.ws_xpixel); | |
1100 | packet_put_int(ws.ws_ypixel); | |
1101 | tio = get_saved_tio(); | |
1102 | tty_make_modes(/*ignored*/ 0, &tio); | |
1103 | packet_send(); | |
1104 | interactive = 1; | |
1105 | /* XXX wait for reply */ | |
1106 | } | |
1107 | if (options.forward_x11 && | |
1108 | getenv("DISPLAY") != NULL) { | |
c6046bb0 | 1109 | char *proto, *data; |
3c0ef626 | 1110 | /* Get reasonable local authentication information. */ |
c6046bb0 | 1111 | x11_get_proto(&proto, &data); |
3c0ef626 | 1112 | /* Request forwarding with authentication spoofing. */ |
1113 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1114 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1115 | interactive = 1; | |
1116 | /* XXX wait for reply */ | |
1117 | } | |
1118 | ||
1119 | check_agent_present(); | |
1120 | if (options.forward_agent) { | |
1121 | debug("Requesting authentication agent forwarding."); | |
1122 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1123 | packet_send(); | |
1124 | } | |
1125 | ||
1126 | len = buffer_len(&command); | |
1127 | if (len > 0) { | |
1128 | if (len > 900) | |
1129 | len = 900; | |
1130 | if (subsystem_flag) { | |
c6046bb0 | 1131 | debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1132 | channel_request_start(id, "subsystem", /*want reply*/ 1); |
1133 | /* register callback for reply */ | |
44a053a3 | 1134 | /* XXX we assume that client_loop has already been called */ |
3c0ef626 | 1135 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
1136 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
1137 | } else { | |
c6046bb0 | 1138 | debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command)); |
3c0ef626 | 1139 | channel_request_start(id, "exec", 0); |
1140 | } | |
1141 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1142 | packet_send(); | |
1143 | } else { | |
c6046bb0 | 1144 | channel_request_start(id, "shell", 0); |
1145 | packet_send(); | |
3c0ef626 | 1146 | } |
3c0ef626 | 1147 | |
3c0ef626 | 1148 | packet_set_interactive(interactive); |
1149 | } | |
1150 | ||
1151 | /* open new channel for a session */ | |
1152 | static int | |
1153 | ssh_session2_open(void) | |
1154 | { | |
1155 | Channel *c; | |
1156 | int window, packetmax, in, out, err; | |
1157 | ||
1158 | if (stdin_null_flag) { | |
1159 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1160 | } else { | |
1161 | in = dup(STDIN_FILENO); | |
1162 | } | |
1163 | out = dup(STDOUT_FILENO); | |
1164 | err = dup(STDERR_FILENO); | |
1165 | ||
1166 | if (in < 0 || out < 0 || err < 0) | |
1167 | fatal("dup() in/out/err failed"); | |
1168 | ||
1169 | /* enable nonblocking unless tty */ | |
1170 | if (!isatty(in)) | |
1171 | set_nonblock(in); | |
1172 | if (!isatty(out)) | |
1173 | set_nonblock(out); | |
1174 | if (!isatty(err)) | |
1175 | set_nonblock(err); | |
1176 | ||
1177 | window = CHAN_SES_WINDOW_DEFAULT; | |
1178 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
c6046bb0 | 1179 | if (tty_flag) { |
1180 | window >>= 1; | |
1181 | packetmax >>= 1; | |
3c0ef626 | 1182 | } |
1183 | c = channel_new( | |
1184 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1185 | window, packetmax, CHAN_EXTENDED_WRITE, | |
7cac2b65 | 1186 | "client-session", /*nonblock*/0); |
3c0ef626 | 1187 | |
1188 | debug3("ssh_session2_open: channel_new: %d", c->self); | |
1189 | ||
1190 | channel_send_open(c->self); | |
1191 | if (!no_shell_flag) | |
c6046bb0 | 1192 | channel_register_confirm(c->self, ssh_session2_setup); |
3c0ef626 | 1193 | |
1194 | return c->self; | |
1195 | } | |
1196 | ||
1197 | static int | |
1198 | ssh_session2(void) | |
1199 | { | |
1200 | int id = -1; | |
1201 | ||
1202 | /* XXX should be pre-session */ | |
1203 | ssh_init_forwarding(); | |
1204 | ||
1205 | if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN)) | |
1206 | id = ssh_session2_open(); | |
1207 | ||
1208 | /* If requested, let ssh continue in the background. */ | |
1209 | if (fork_after_authentication_flag) | |
1210 | if (daemon(1, 1) < 0) | |
1211 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1212 | ||
1213 | return client_loop(tty_flag, tty_flag ? | |
1214 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1215 | } | |
1216 | ||
1217 | static void | |
1218 | load_public_identity_files(void) | |
1219 | { | |
1220 | char *filename; | |
3c0ef626 | 1221 | int i = 0; |
c6046bb0 | 1222 | Key *public; |
3c0ef626 | 1223 | #ifdef SMARTCARD |
c6046bb0 | 1224 | Key **keys; |
1225 | ||
3c0ef626 | 1226 | if (options.smartcard_device != NULL && |
c6046bb0 | 1227 | options.num_identity_files < SSH_MAX_IDENTITY_FILES && |
1228 | (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) { | |
1229 | int count = 0; | |
1230 | for (i = 0; keys[i] != NULL; i++) { | |
1231 | count++; | |
1232 | memmove(&options.identity_files[1], &options.identity_files[0], | |
1233 | sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1234 | memmove(&options.identity_keys[1], &options.identity_keys[0], | |
1235 | sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1)); | |
1236 | options.num_identity_files++; | |
1237 | options.identity_keys[0] = keys[i]; | |
7cac2b65 | 1238 | options.identity_files[0] = sc_get_key_label(keys[i]); |
c6046bb0 | 1239 | } |
1240 | if (options.num_identity_files > SSH_MAX_IDENTITY_FILES) | |
1241 | options.num_identity_files = SSH_MAX_IDENTITY_FILES; | |
1242 | i = count; | |
1243 | xfree(keys); | |
3c0ef626 | 1244 | } |
1245 | #endif /* SMARTCARD */ | |
1246 | for (; i < options.num_identity_files; i++) { | |
1247 | filename = tilde_expand_filename(options.identity_files[i], | |
1248 | original_real_uid); | |
1249 | public = key_load_public(filename, NULL); | |
1250 | debug("identity file %s type %d", filename, | |
1251 | public ? public->type : -1); | |
1252 | xfree(options.identity_files[i]); | |
1253 | options.identity_files[i] = filename; | |
1254 | options.identity_keys[i] = public; | |
1255 | } | |
1256 | } |